CN116730558B - Sewage purification system and method for facilities along highway - Google Patents
Sewage purification system and method for facilities along highway Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 67
- 238000000746 purification Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 221
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 57
- 239000011593 sulfur Substances 0.000 claims abstract description 57
- 239000000945 filler Substances 0.000 claims abstract description 56
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 42
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 21
- 244000005700 microbiome Species 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 5
- 231100000719 pollutant Toxicity 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 73
- 238000012856 packing Methods 0.000 claims description 15
- 238000011049 filling Methods 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052799 carbon Inorganic materials 0.000 abstract description 18
- 239000010802 sludge Substances 0.000 abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 67
- 229910052757 nitrogen Inorganic materials 0.000 description 35
- 241000894006 Bacteria Species 0.000 description 20
- 238000004064 recycling Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 16
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 9
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
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- 230000003647 oxidation Effects 0.000 description 5
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- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000008635 plant growth Effects 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 2
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- 238000004659 sterilization and disinfection Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
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- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a sewage purification system and a sewage purification method for facilities along a highway, at least comprising a main body reaction unit (22), wherein the main body reaction unit (22) is longitudinally divided into a deep treatment unit (7) and a water storage unit (11) by a supporting plate (9), and microorganisms capable of performing sulfur autotrophic denitrification reaction are arranged in at least one filler layer (8) in the deep purification unit so as to decompose pollutants. The microorganism of the sulfur autotrophic denitrification reaction at least comprises a material mixed by sulfur and calcium carbonate according to a certain proportion. In order to solve the problem that a sewage purification system of facilities along a highway needs to increase a carbon source in the peak period of sewage treatment, the advanced treatment unit adopts a filler biomembrane form to treat sewage, no surplus sludge is generated, the carbon source is not required to be increased when the sewage treatment capacity is suddenly increased in a short period, and the sewage treatment capacity is not influenced by water quantity and water quality fluctuation.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage purification system and method for facilities along a highway.
Background
Along with the rapid development of the economy in China, the construction of the expressway in China rapidly develops. The rapid development of highways also brings about corresponding environmental problems. The sewage treatment in the service area is always a key problem which puzzles the operation and management of the expressway. At present, a contact oxidation method, an AO method, a biological rotating disc method and the like are mostly adopted for secondary sewage treatment of a highway service area, and the secondary treatment has very limited total nitrogen removal, higher total nitrogen in effluent and mainly nitrate nitrogen due to the characteristics of large fluctuation of water quality and water quantity, low carbon nitrogen ratio, high nitrogen concentration and the like of the sewage in the service area. Along with the proposal of the cooperative concept of pollution reduction and carbon reduction of the prior service area, in order to realize the recycling of sewage resources of the expressway service area, secondary effluent is required to be subjected to advanced treatment and then reused for flushing toilet, greening and the like of the service area.
Specifically, the amount of sewage in the highway service area is related to the number of vehicles passing. The number of vehicles passing through the server on holidays is 2-3 times of that on common workdays, and the number of people going out is obviously increased. Therefore, the flow of people passing through the expressway service area is 2-5 times of the flow of people in working days. The amount of sewage generated by the service area on holidays is peaked, and the amount of sewage generated by the service area on weekdays falls back from the peak. Therefore, it is difficult to apply the conventional contact oxidation method, AO method, bio-disc method, etc. to a service area having a large fluctuation of water amount. If the water treatment scale is set large, the water treatment scale is put into a state where the water treatment capacity is small on a working day, and a part of bacterial flora dies. If the water treatment scale is set to 1.5 times of the sewage treatment capacity of a working day, the bacterial community can not completely remove nitrogen when a large amount of sewage is discharged in holidays, and the nitrogen removal efficiency is reduced.
At present, the advanced treatment technology of secondary effluent water in the expressway service area mostly adopts technologies such as artificial wetland, soil treatment, stabilization pond treatment and the like, and has a certain total nitrogen removal effect, but the nitrogen required by plant growth is limited, the TN removal capability is not strong, and the above treatment technology needs a large floor area and is not an optimal solution.
Aiming at the problems, the invention utilizes the sulfur autotrophic denitrification technology to construct the water storage device based on advanced treatment and self-purification of the secondary effluent of the highway service area, thereby realizing the advanced treatment and the cyclic utilization of the secondary effluent and further realizing the cyclic utilization of the sewage of the highway service area. The device is simple to operate, high in total nitrogen removal efficiency, small in occupied area and low in running cost, and has good economic benefit and practical significance.
For example, chinese patent publication No. CN206692523U discloses a sewage treatment system for a highway service station, which comprises a septic tank, an oil separation sedimentation tank, a grille tank, a regulating tank, a movable biological bed reactor, an MBR membrane tank, a disinfection tank, a sludge concentration tank, a filter press and a recycling tank, wherein a sewage pipeline of the highway service station is communicated with a liquid inlet of the septic tank, a liquid outlet of the septic tank is communicated with a liquid inlet of the oil separation sedimentation tank, a liquid outlet of the oil separation sedimentation tank is communicated with a liquid inlet of the grille tank, a liquid outlet of the grille tank is communicated with a first liquid inlet of the regulating tank, a liquid outlet of the regulating tank is communicated with a liquid inlet of the movable biological bed reactor, a liquid outlet of the movable biological bed reactor is communicated with a liquid inlet of the MBR membrane tank, a liquid outlet of the MBR membrane tank is communicated with a liquid inlet of the MBR tank, a liquid outlet of the septic tank is communicated with a liquid inlet of the tank, a liquid outlet of the oil separation sedimentation tank, a liquid outlet of the filter press of the sludge is communicated with a liquid outlet of the disinfection tank, and a liquid outlet of the sludge is communicated with a liquid outlet of the sludge concentration tank. Although the utility model can avoid secondary pollution by pretreatment, biochemical treatment and comprehensive treatment with a film, the utility model consumes more resources and does not meet the development trend of reducing carbon emission.
The present invention contemplates a wastewater treatment system that can be adapted for use in a highway line facility for reducing carbon emissions.
Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, since the applicant has studied a lot of documents and patents while making the present invention, the text is not limited to details and contents of all but it is by no means the present invention does not have these prior art features, but the present invention has all the prior art features, and the applicant remains in the background art to which the right of the related prior art is added.
Disclosure of Invention
The amount of sewage in the highway service area is related to the number of vehicles passing. The number of vehicles passing through the server on holidays is 2-3 times of that on ordinary workdays, and the number of people going out is obviously increased, so that the traffic of people passing through the expressway service area is 2-5 times of that on workdays. The amount of sewage generated by the service area on holidays is peaked, and the amount of sewage generated by the service area on weekdays falls back from the peak. Common contact oxidation method, AO method, biological rotating disc method and the like are difficult to be applied to service areas with large water fluctuation. If the water treatment scale is set large, the water treatment scale is put into a state where the water treatment capacity is small on a working day, and a part of bacterial flora dies. If the water treatment scale is set to be 1.5 times of the sewage treatment capacity of a working day, when the holiday comes, the bacteria cannot completely remove nitrogen when a large amount of sewage is discharged, and the nitrogen removal efficiency is reduced.
Therefore, how to reasonably set the sewage purification system according to the characteristic of large sewage quantity fluctuation along the highway is a technical problem which is not solved at present.
Aiming at the defects of the prior art, the invention provides a sewage purification system for facilities along a highway, which at least comprises a main body reaction unit. The main body reaction unit is divided into a deep treatment unit and a water storage unit by a support plate in the longitudinal direction. The depth processing unit is arranged above the water storage unit. At least one layer of filler layer in the deep purification unit is provided with microorganisms capable of performing sulfur autotrophic denitrification reaction so as to decompose pollutants. The sulfur autotrophic denitrification process is an autotrophic reaction, does not need an additional carbon source, and can stably realize the removal of nitrogen in the sewage with low carbon nitrogen ratio. In addition, the sulfur autotrophic denitrifying bacteria are autotrophic bacteria, the propagation period is longer, a large amount of excess sludge is avoided in the operation process, and the operation cost is greatly reduced.
The filler layer at least comprises a material mixed by sulfur and calcium carbonate. In the running process of the sulfur autotrophic denitrification filter, sulfur filler provides a sulfur source, and calcium carbonate filler is used as slow-release filler to provide alkalinity so as to jointly maintain the optimal alkalinity environment of the sulfur autotrophic denitrification microorganism.
Preferably, the filling volume ratio of the sulfur to the calcium carbonate is 1-5: 2. in the range of the proportional valve, no excess sludge is generated, and a reflux device is arranged at the bottom of the water storage unit, so that the water storage unit is not influenced by water quantity and water quality fluctuation.
Preferably, the deep purification unit and the water storage unit are respectively connected with the control unit and respond to the control instruction of the control unit, when no reuse water request is received under the condition that the distance between the liquid level of the water storage unit and the bottom of the deep purification unit is smaller than a distance threshold value, the control unit controls the third control valve to be opened so as to enable part of water to be discharged, and when the liquid level of the water storage unit is lower than the liquid level threshold value, the control unit controls the third control valve to be closed.
The invention can realize the multifunctional linkage of water outlet, circulation, reuse and the like of the device by automatically controlling the automatic control valve for water outlet, circulation and reuse, has high degree of automation, ensures that the water storage passes through the advanced treatment unit for multiple times to realize the circulation treatment, and ensures that the water quality of the water storage is further improved.
Preferably, the purification system further comprises a water outlet unit, the water outlet unit at least comprises a lift pump start-stop controller, a first control valve and a second control valve, and the control unit controls the lift pump start-stop controller and the first control valve to be respectively opened in response to a reuse water request so as to realize water storage recycling. The purified water can be reused through water storage and reuse, and water resources are further saved.
And responding to a water storage circulation treatment request, the control unit controls the lift pump start-stop controller and the second control valve to be respectively opened and controls the first control valve to be closed so as to realize the circulation treatment of the water storage. Through the circulation treatment of water storage, under the condition that sewage treatment capacity descends, can also have sufficient sewage to maintain the stability of microorganism fungus crowd, can also make the nitrogen removal effect of sewage better simultaneously.
Preferably, the system further comprises a liquid level control unit connected with the control unit, wherein the liquid level control unit at least comprises a float valve and a liquid level sensor. The liquid level sensor is connected with the ball float valve through a valve rod, and the control unit adjusts at least one valve in the water outlet unit based on liquid level data sent by the liquid level sensor so as to control the liquid level of the water storage unit. Through controlling the liquid level, the condition of sewage treatment affecting the packing layer when the water storage is too much is avoided, so that the sewage treatment efficiency is kept stable.
Preferably, the device further comprises a pretreatment unit, wherein the pretreatment unit is connected with the water distribution component, and the pretreatment can filter out particulate matters in advance. The water distribution component is arranged in an upper water distribution area of the deep treatment unit to distribute water to the packing layer in a non-impact mode. The non-impact water distribution can ensure that the filler layer is uniformly paved and is not influenced by water impact, and the environmental state of the microbial flora is maintained stable.
Preferably, the top of the main body reaction unit is provided with an exhaust port, and the exhaust port is a unidirectional air port. The one-way air port is arranged, so that excessive inflow of external air can be effectively avoided, and a good anoxic environment in the device is maintained.
Preferably, the filling volume ratio of the sulfur to the calcium carbonate is 1:1. during backwash, sulphur and calcium carbonate 1: the mixing proportion of 1 can ensure even mixing of the filler and avoid uneven layering of the filler caused by back flushing operation.
The invention also provides a method for purifying sewage of facilities along the highway, which at least comprises the following steps: at least one layer of filler layer in the deep purification unit is provided with microorganisms capable of performing sulfur autotrophic denitrification reaction so as to decompose pollutants. The filler layer at least comprises a material mixed by sulfur and calcium carbonate. The sulfur autotrophic denitrification process is an autotrophic reaction, does not need an additional carbon source, and can stably remove nitrogen in the sewage with low carbon nitrogen ratio. In addition, the sulfur autotrophic denitrifying bacteria are autotrophic bacteria, the propagation period is longer, a large amount of excess sludge is avoided in the operation process, and the operation cost is greatly reduced.
Preferably, the filling volume ratio of the sulfur to the calcium carbonate is 1-5: 2. in the range of the proportional valve, no excess sludge is generated, and a reflux device is arranged at the bottom of the water storage unit, so that the water storage unit is not influenced by water quantity and water quality fluctuation.
Preferably, the method further comprises: setting a deep purification unit higher than a water storage unit, controlling a third control valve to be opened to enable partial water to be discharged by a control unit when no reuse water request is received under the condition that the distance between the water storage unit and the bottom of the deep purification unit is smaller than a distance threshold value, and controlling the third control valve to be closed by the control unit under the condition that the liquid level of the water storage unit is lower than a liquid level threshold value.
The invention can realize the multifunctional linkage of water outlet, circulation, reuse and the like of the device by automatically controlling the automatic control valve for water outlet, circulation and reuse, has high degree of automation, ensures that the water storage passes through the advanced treatment unit for multiple times to realize the circulation treatment, and ensures that the water quality of the water storage is further improved.
The method can realize the functions of advanced treatment, storage and recycling of the secondary effluent in the high-speed service area through a single tank body, shortens the process chain, reduces the occupied area and obviously reduces the sewage treatment cost.
Drawings
Fig. 1 is a simplified module connection diagram of a sewage purification system for facilities along a highway according to a preferred embodiment of the present invention.
List of reference numerals
1: A water inlet pipe; 2: a water inlet; 3: a filter assembly; 4: a water distribution component; 5: a preprocessing unit; 6: a water distribution area; 7: a deep purification unit; 8: a filler layer; 9: a support plate; 10: a sampling hole; 11: a water storage unit; 12: a lift pump; 13: a recycling pipe; 14: a lift pump start-stop controller; 15: a first control valve; 16: a check valve; 17: a second control valve; 18: a water outlet pipe; 19: a water outlet; 20: a third control valve; 21: an exhaust port; 22: a main body reaction unit; 23: a float valve; 24: a valve stem; 25: a liquid level sensor; 26: and a control unit.
Detailed Description
The following detailed description refers to the accompanying drawings.
In the prior art, the sewage treatment of the service area mostly adopts a contact oxidation method, an AO method, a biological rotating disc method and the like, so that the total nitrogen content of the secondary effluent is difficult to reach the standard, and the main component of nitrogen is nitrate nitrogen. In order to further reduce the total nitrogen content, the prior art is generally connected with technologies such as artificial wetland, soil treatment and the like after the secondary treatment procedure of water. Although a certain total nitrogen removal effect can be achieved in this way, the removal capacity for TN is not strong because of the limited nitrogen required for plant growth, and the above treatment technique requires a very large floor space. Or the prior art also adds a denitrification process in the secondary treatment process of sewage. However, because of the low carbon to nitrogen ratio in the wastewater, additional carbon sources are required, which increases the treatment cost and increases the carbon emissions during the life cycle of the treatment process. None of the above prior art is an optimal solution for sewage treatment in facilities along highways, which is difficult to accommodate the characteristics of abrupt and rapid increase in sewage treatment capacity in high-speed service areas on holidays. In order to make up for the defects of the prior art, the invention improves the purification mode of the deep purification unit, adopts the sulfur autotrophic denitrification technology to carry out the deep treatment on the secondary effluent, and improves the nitrogen removal efficiency.
Example 1
The sewage purification system of the highway along-line facilities at least comprises a main body reaction unit 22, a deep purification unit 7, a water storage unit 11, a water outlet unit and a control unit 26. The deep purification unit 7, the water storage unit 11 and the water outlet unit are respectively connected with the control unit 26 and respond to the control instruction of the control unit 26. The water inlet unit is also connected to the control unit 26 and is controlled by the control unit 26.
The control unit 26 of the present invention is an application specific integrated chip, a processor, a single chip microcomputer, or the like capable of executing an operation program of the method of the present invention.
As shown in fig. 1, the main body reaction unit 22 is an integrated unit, the inside of which is divided into a pretreatment unit 5, a deep purification unit 7, and a water storage unit 11 in order from high to low. The preprocessing unit 5 is disposed at a position higher than the depth processing unit 7. The depth processing unit 7 is disposed at a position higher than the water storage unit 11.
The pretreatment unit 5 is connected with the water inlet unit so as to discharge the sewage to be treated into the pretreatment unit 5 and perform pretreatment. The water inlet unit at least comprises a water inlet pipe 1, a water inlet 2, a filtering component 3 and a water distribution component 4. The water inlet 2 is arranged at the inlet of the pretreatment unit 5. The filter assembly 3 is provided in the pretreatment unit 5 for filtering the intake water. The filter assembly 3 is, for example, a filter plate, filter cotton or the like. The water outlet of the pretreatment unit 5 is connected with the water distribution component 4. The water distribution assembly 4 is preferably a pipeline provided with dense water distribution holes. Preferably, the water distribution holes are arranged according to a certain rule or uniformly.
Preferably, as shown in fig. 1, the pretreatment unit 5 is disposed at an offset side of the deep purification unit 7, so that the water distribution assembly 4 can be disposed at the water distribution area 6 above the deep purification unit 7 for non-impact water distribution. By the arrangement, the water distribution assembly 4 can widely distribute pretreated sewage on each area of the surface of the deep water purification unit 7, and uneven sewage distribution is avoided. If the water distribution assembly 4 distributes water only in the same area, the area to be distributed with water can be deformed in structure under the impact of water flow. The structural deformations are for example pits formed by the impact. Thus, the strain distribution is uneven, which is unfavorable for the long-term wide distribution of the strain and the activity maintenance of a large number of strains.
Preferably, the liquid level difference between the pretreatment unit 5 and the advanced treatment unit is based. The water distribution component 4 is arranged in a water distribution area 6 in a space vertically above the advanced treatment unit, so that the inflow water can be uniformly dispersed in the advanced treatment unit. By the arrangement, the inflow water can flow based on the action of gravity, so that the use of power devices such as pumps and the like is reduced, and the consumption of energy sources is reduced.
The secondary effluent is taken as the water inlet and flows through the water inlet pipe 1 into the water inlet 2 of the device by gravity self-flowing or pressurization lifting, then is filtered by the filtering component 3, further intercepts trace suspended impurities in the water, and finally flows into the water distribution component 4 by self-flowing for uniform water distribution.
Preferably, the depth processing unit comprises at least a support plate 9, a filler layer 8 and at least one sampling hole 10. The support plate 9 is provided inside the main body reaction unit 22 in such a manner as to divide the main body reaction unit 22 into the deep purification unit 7 and the water storage unit 11 in the longitudinal direction. The sampling hole 10 is arranged on the side wall of the deep purification unit 7 approaching to the supporting plate 9 so as to realize the replacement and the supplementation of the filler.
Preferably, the packing layer 8 in the deep purification unit comprises at least a material mixed by sulfur and calcium carbonate in a certain proportion. The filling volume ratio of the sulfur to the calcium carbonate is 1-5: 2. the filler particle size is preferably: the particle size of the sulfur filler is 10-80 meshes. The particle size of the calcium carbonate filler is 10-80 meshes.
More preferably, the ratio of sulphur to calcium carbonate is 1:1. the particle size of the filler is 20 meshes of sulfur filler and 20 meshes of calcium carbonate filler. The advanced treatment unit adopts a filler biomembrane form, no excess sludge is generated, and a reflux device is arranged at the bottom of the water storage unit, so that the water storage unit is not influenced by water quantity and water quality fluctuation.
In the invention, the volume of the packing layer is related to the concentration of nitrate nitrogen in the inlet water. The filler layer volume is preferably: 30m 3～100m3.
Under the condition that the volume of the packing layer is 30m 3, the concentration of the inflow nitrate nitrogen is C ( Nitrate nitrogen ) =0-40 mg/L.
Under the condition that the volume of the packing layer is 50m 3, the concentration of the inflow nitrate nitrogen is C ( Nitrate nitrogen ) =40-100 mg/L.
Under the condition that the volume of the packing layer is 100m 3, the concentration of the inflow nitrate nitrogen is C ( Nitrate nitrogen ) =100-200 mg/L.
Preferably, the volume of the packing layer is 30m 3, and the concentration of the nitrate nitrogen in the inlet water is 40mg/L. Under the condition of normal operation of secondary sewage treatment in the service area, the total nitrogen in the effluent is below 40mg/L, so that the packing layer volume of the device of the invention is 30m 3, and the requirement of secondary effluent advanced treatment and recycling in the service area can be met.
At present, a contact oxidation method, an AO method, a biological rotating disc method and the like are mostly adopted for sewage treatment in expressway service areas. The processes are all based on heterotrophic denitrification, i.e. the heterotrophic denitrification microorganisms remove total nitrogen by consuming organic carbon sources in the water. Because the expressway service area has the characteristics of low carbon nitrogen ratio, high nitrogen concentration and the like of sewage, the total nitrogen of the secondary effluent is difficult to reach the standard under the condition of no additional carbon source, and the main component of nitrogen is nitrate nitrogen. One solution to achieve deep nitrogen removal is to add an additional organic carbon source to supplement the carbon source requirements of the heterotrophic denitrification process. The long-term carbon source addition greatly increases the running cost. In addition, the carbon source is added, and the problems that the carbon source is not accurately added, secondary pollution is caused by excessive addition, the effluent COD exceeds the standard risk and the like are solved. Therefore, the secondary effluent needs to be deeply treated.
At present, the advanced treatment technology of secondary effluent water in the expressway service area mostly adopts technologies such as artificial wetland, soil treatment, stabilization pond treatment and the like, and has a certain total nitrogen removal effect, but the nitrogen required by plant growth is limited, and the removal capability of TN is not strong, so that the treatment technology needs a very large occupied area.
The principle of nitrogen removal of the filler layer 8 is as follows.
The inflow water of the system drops on the filler of the filler layer 8 through the water distribution component 4 and flows through the filler surface of the filler layer from top to bottom in sequence to perform a sulfur autotrophic denitrification and denitrification reaction with sulfur autotrophic denitrifying bacteria growing on the filler surface, so that nitrate nitrogen in water is converted into nitrogen gas, and denitrification is realized. The sulfur autotrophic denitrification reaction is as follows: the sulfur autotrophic denitrifying bacteria reduce NO 3 - -N or NO 2 - -N to N 2 by taking reduced sulfur as an electron donor.
The filler layer 8 adopted by the invention has the advantages that: the sulfur autotrophic denitrifying bacteria reduce NO 3 - -N or NO 2 - -N to N 2 by using reduced sulfur as an electron donor. The sulfur autotrophic denitrification process is an autotrophic reaction, does not need an additional carbon source, and can stably realize the removal of nitrogen in the sewage with low carbon nitrogen ratio. In addition, the sulfur autotrophic denitrifying bacteria are autotrophic bacteria, the propagation period is longer, a large amount of excess sludge is avoided in the operation process, and the operation cost is greatly reduced.
Under the condition that the sewage treatment capacity is suddenly increased in holidays and short peaks appear, the sulfur autotrophic denitrifying bacteria can be rapidly propagated and maintain stable nitrogen removal capacity. When the sewage treatment capacity rapidly decreases in working days, the sulfur autotrophic denitrifying bacteria can also maintain the nitrogen treatment capacity of the sulfur autotrophic denitrifying bacteria, and the problems that the sulfur autotrophic denitrifying bacteria suddenly decrease and the nitrogen treatment capacity is attenuated are avoided.
The ratio of sulfur to calcium carbonate is set to be 1:1, so that the technical effect is better.
First, the ratio of sulfur to calcium carbonate is preferably 1:1, the ratio was verified by gradient test. In the running process of the sulfur autotrophic denitrification filter, sulfur filler provides a sulfur source, and calcium carbonate filler is used as slow-release filler to provide alkalinity so as to jointly maintain the optimal alkalinity environment of the sulfur autotrophic denitrification microorganism. Meanwhile, the filler layer needs to be backwashed regularly in the running process, and fresh biological films are updated, so that the higher activity of the biological films on the surface of the filler is ensured. During backwash, sulphur and calcium carbonate 1: the mixing proportion of 1 can ensure even mixing of the filler and avoid uneven layering of the filler caused by back flushing operation. Secondly, 1: the mixing proportion of 1 can also ensure the synchronous consumption and replacement period of the sulfur and siderite filler, and avoid the phenomenon of filler waste caused by operation consumption time-staggered.
The liquid purified by the deep purification unit 7 is collected in the water storage unit 11 in the main body reaction unit 22.
The water storage unit 11 comprises at least a lift pump 12, a recycling pipe 13 and a lift pump start-stop controller 14. The lifting pump 12 is arranged at the bottom of the water storage unit 11 near the side wall of the main body reaction unit 22, and is connected with the water distribution component 4 through the recycling pipe 13 and the second control valve 17. A first control valve 15 and a check valve 16 are sequentially arranged at one end of the recycling pipe 13, which is far away from the lift pump 12 and the water distribution component 4. A second control valve 17 is arranged at one end of the water distribution component 4 close to the recycling pipe 13. The second control valve 17 is used for on-off control of the circulation process of the stored water in the water storage unit 11.
Preferably, the apparatus of the present invention further comprises a liquid level control unit. The liquid level control unit is connected to the control unit 26 in a preferred and/or wireless manner. The liquid level control unit comprises at least a float valve 23 and a liquid level sensor 25. A level sensor 25 is provided in the water storage unit 11 to monitor the liquid level, and the level sensor 25 is connected to the float valve 23 through a valve stem 24. The control unit 26 adjusts at least one valve in the water outlet unit based on the liquid level data sent by the liquid level sensor 25 to achieve control of the liquid level of the water storage unit.
Preferably, the water outlet unit comprises at least a lift pump start-stop controller 14 and a first control valve 15. The outlet unit further comprises an outlet pipe 18, an outlet port 19, a third control valve 20 and a check valve 16. The water outlet 19 is provided on a side wall of the water storage unit 11 approaching the bottom. A third control valve 20 and a check valve 16 are sequentially arranged on the water outlet pipe 18 near one end of the water outlet 19.
Preferably, the water outlet 19 is spaced from the bottom of the water storage unit 11 by a vertical distance of 0.2 to 0.5 m. The vertical distance of the liquid level sensor from the bottom end of the supporting plate 9 is 0.1-0.5 m. The vertical distance between the sampling hole 10 and the top end of the supporting plate is 0.1-0.4 meter. The set distance of the liquid level of the water storage unit from the bottom of the supporting plate is 0.5 meter.
A lift pump start-stop controller 14 is provided on the lift pump 12. The second control valve 17 is arranged on the water distribution component 4 in the water inlet unit. The recycling pipe 13 is connected with the water distribution component 4 through a second control valve 17. In response to the reuse water request, the lift pump start-stop controller 14 is started, the control unit controls the first control valve 15 to be opened, and the second control valve 17 to be closed, so that water storage reuse is realized.
Preferably, the water outlet is at a vertical distance of 0.3 meters from the bottom of the water storage unit. The vertical distance from the top end of the liquid level transmitter to the bottom end of the supporting plate is 0.2 meter. The vertical distance of the sampling hole 10 from the top end of the support plate is 0.2 meter. The set distance of the liquid level of the water storage unit from the bottom of the supporting plate is 0.5 meter.
Preferably, the deep purification unit 7 is disposed at a position higher than the water storage unit 11. In the case where the distance between the water storage unit 11 and the bottom of the deep purification unit 7 is smaller than the distance threshold, the control unit 26 controls the third control valve 20 to be opened so that part of the water is discharged when the reuse water request is not received, and in the case where the liquid level is lower than the liquid level threshold, the control unit 26 controls the third control valve 20 to be closed.
For example, when the distance between the liquid level of the water storage unit 11 and the bottom of the support plate 9 is smaller than the distance threshold, and when the user does not need the reuse water, the third control valve 20 is opened, the water is discharged, and when the liquid level of the water storage unit 11 is lower than the set liquid level at the top of the lift pump 12, the third control valve 20 is closed.
When the distance between the liquid level of the water storage unit 11 and the bottom of the supporting plate 9 is smaller than the distance threshold value, and when the user needs reuse water at the moment, the lifting pump start-stop controller 14 is started, the first control valve 15 is opened, the second control valve 17 is closed, water storage recycling is performed, and when the liquid level of the water storage unit 11 is lower than the set liquid level at the top of the lifting pump 12, the lifting pump start-stop controller 14 and the first control valve 15 are closed.
When the distance of the liquid level of the water storage unit 11 from the bottom of the support plate 9 is greater than the distance threshold and when the user does not have the reuse water demand at this time, the lift pump start-stop controller 14 and the second control valve 17 are opened, the water stored in the water storage unit 11 is circulated (to achieve better water quality), and when the operation is designated time or the user has the reuse water demand, the second control valve 17 is closed.
By the arrangement, the automatic control valve for water outlet, circulation, recycling and the like is additionally arranged in the device, so that the multifunctional linkage of water outlet, circulation, recycling and the like of the device can be realized, the automation degree is high, and the operation is simple.
Preferably, the aspect ratio of the main reaction unit 22 is 2 to 10:1. the volume ratio of the pretreatment unit, the water distribution area, the deep treatment unit and the water storage unit is 1-20: 1: 5-30: 5 to 100.
More preferably, the aspect ratio of the main body reaction unit 22 is 1:1. the volume ratio of the pretreatment unit, the water distribution area, the deep treatment unit and the water storage unit is 2:1:6:9.
Preferably, the top of the main body reaction unit 22 is provided with an exhaust port 21. The exhaust port is a one-way air port. The optimal working environment of the sulfur autotrophic denitrifying bacteria is anoxic or anaerobic, and the activity of the sulfur autotrophic denitrifying bacteria can be inhibited in a good-culture or microaerobic state, so that the denitrification efficiency of the sulfur autotrophic denitrifying bacteria is reduced. The one-way air port is arranged, so that excessive inflow of external air can be effectively avoided, and a good anoxic environment in the device is maintained.
The temperature and alkalinity can affect the sewage treatment efficiency of the sulfur autotrophic denitrifying bacteria in the packing layer 8. Preferably, the deep purification unit 7 of the present invention can also be provided with a temperature detection assembly and/or a PH detection assembly. The type of the temperature detecting component is not limited, such as a waterproof water temperature detector, a water temperature sensor, and the like. The PH detecting component is, for example, a PH detector or the like. The optimum pH for sulfur autotrophic denitrification is about 7.0. The temperature sensing assembly and/or the PH sensing assembly can be connected to the control unit 26 by wire or wirelessly. The sewage treatment efficiency is evaluated based on the received temperature parameter and PH parameter and a preset treatment efficiency sample related to the temperature and PH parameter. Preferably, a heating assembly can also be provided in the depth purification unit 7. The heating element is, for example, a heating wire, an electric heating system or the like, for increasing the temperature of the environment in the deep purification unit 7, and preventing the environment with too low a temperature from reducing the treatment efficiency of the flora. The heating assembly is connected to the control unit 26 in a wired or wireless manner and is controlled by the control unit 26.
Preferably, the packing layer 8 of the deep purification unit 7 comprises at least two sub-packing layers arranged in a stepwise height. The temperature in the sub-filler layer increases as the height of the sub-filler layer decreases. The temperature in the sub-packing layer is heated by a heating assembly, which is controlled and regulated by the control unit 26. For example, the first height of the first sub-filler layer is higher than the second height of the second sub-filler layer. Then, the second temperature of the second sub-filler layer is 0.5-3 degrees celsius higher than the first temperature of the first sub-filler layer. For example, the temperature difference is 0.5 ℃,1 ℃, 1.5 ℃,2 ℃, 2.5 ℃, etc. The principle of such arrangement is: to save space for sewage treatment, sewage treatment systems are typically deployed underground. The subsurface temperature is generally lower than the surface temperature. And the farther from the surface, the lower the temperature. The optimum temperature of the sulfur autotrophic denitrification is about 30 ℃. The low temperature inhibits the denitrification performance of the denitrifying bacteria system, which in turn results in a reduced denitrification rate. In general, the temperature of the second sub-filler layer tends to be lower as the distance from the surface increases. Therefore, along with the stepwise change of the heights of the sub-filler layers, the temperatures of the sub-filler layers also stepwise change so as to compensate the temperature loss of the sub-filler layers with lower heights caused by the surrounding environment and maintain the stability of the activity of the sulfur autotrophic denitrifying bacteria in the sub-filler layers.
Preferably, the number of sub-filler layers in the filler layer 8 is not limited to two, but may be three or more.
Example 2
This embodiment is a further improvement of embodiment 1, and the repeated contents are not repeated.
The invention provides a sewage purification method for facilities along a highway, which at least comprises the following steps:
The liquid purified by the deep purification unit is inputted to the water storage unit 11 in the main body reaction unit 22 and collected, and the control unit 26 adjusts at least one valve in the water outlet unit based on the liquid level data transmitted by the liquid level sensor 25 to realize the control of the liquid level of the water storage unit.
In response to the reuse water request, the control unit 26 controls the lift pump start-stop controller 14 to be started, the first control valve 15 to be opened, and the second control valve 17 to be closed, so that water storage reuse is realized. The first control valve 15 is arranged on the recycling pipe 13 in the water storage unit, the second control valve 17 is arranged on the water distribution component 4 in the water inlet unit, and the recycling pipe 13 is connected with the water distribution component 4 through the second control valve 17.
The deep purification unit 7 is disposed higher than the water storage unit 11. In the case where the distance between the water storage unit 11 and the bottom of the deep purification unit 7 is smaller than the distance threshold, the control unit 26 controls the third control valve 20 to be opened so that part of the water is discharged when the reuse water request is not received, and in the case where the liquid level is lower than the liquid level threshold, the control unit 26 controls the third control valve 20 to be closed.
For example, when the distance of the liquid level of the water storage unit 11 from the bottom of the support plate 9 is smaller than the distance threshold, and when the user does not need the reuse water at this time, the third control valve 20 is opened, and the water storage is discharged. The third control valve 20 is closed when the liquid level of the water storage unit 11 is below the set liquid level at the top of the lift pump 12.
When the distance between the liquid level of the water storage unit 11 and the bottom of the supporting plate 9 is smaller than the distance threshold, when the user needs reuse water at the moment, the lifting pump start-stop controller 14 is started, the first control valve 15 is opened, the second control valve 17 is closed, water storage recycling is performed, and when the liquid level of the water storage unit 11 is lower than the set liquid level at the top of the lifting pump 12, the lifting pump start-stop controller 14 and the first control valve 15 are closed.
When the distance of the liquid level of the water storage unit 11 from the bottom of the support plate 9 is greater than the distance threshold and when the user has a reuse water demand at this time, the lift pump start-stop controller 14 and the second control valve 17 are opened, the water stored in the water storage unit 11 is circulated (to achieve better water quality), and the second control valve 15 is closed when the operation is designated time or when the user has a reuse water demand. By the arrangement, the automatic control valve for water outlet, circulation, recycling and the like is additionally arranged in the device, so that the multifunctional linkage of water outlet, circulation, recycling and the like of the device can be realized, the automation degree is high, and the operation is simple.
It should be noted that the above-described embodiments are exemplary, and that a person skilled in the art, in light of the present disclosure, may devise various solutions that fall within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the invention is defined by the claims and their equivalents. The description of the invention encompasses multiple inventive concepts, such as "preferably," "according to a preferred embodiment," or "optionally," all means that the corresponding paragraph discloses a separate concept, and that the applicant reserves the right to filed a divisional application according to each inventive concept.
Claims (7)
1. A sewage purification system for facilities along a highway, at least comprising a main body reaction unit (22), wherein the main body reaction unit (22) is longitudinally divided into a deep purification unit (7) and a water storage unit (11) by a supporting plate (9), and is characterized in that,
At least one filler layer (8) in the deep purification unit is internally provided with microorganisms capable of performing sulfur autotrophic denitrification reaction so as to decompose pollutants;
The filler layer (8) at least comprises a material mixed by sulfur and calcium carbonate;
the deep purification unit (7) and the water storage unit (11) are respectively connected with the control unit (26) and respond to the control instruction of the control unit (26),
In case the distance between the liquid level of the water storage unit (11) and the bottom of the deep purification unit (7) is smaller than a distance threshold, when no request for reuse water is received, the control unit (26) controls the third control valve (20) to open so that part of the water is discharged,
The control unit (26) controls the third control valve (20) to be closed in case the liquid level of the water storage unit (11) is below a liquid level threshold.
2. The highway line facility sewage purification system of claim 1, wherein the filling volume ratio of the sulfur to the calcium carbonate is 1-5: 2.
3. The highway line facility sewage purification system according to claim 1, further comprising a water outlet unit comprising at least a lift pump start-stop controller (14), a first control valve (15) and a second control valve (17),
In response to a reuse water request, the control unit controls the lift pump start-stop controller (14) and the first control valve (15) to be respectively opened so as to realize water storage reuse;
In response to a water storage circulation treatment request, the control unit controls the lift pump start-stop controller (14) and the second control valve (17) to be respectively opened and controls the first control valve (15) to be closed so as to realize the water storage circulation treatment.
4. The sewage purification system for highway line facilities according to claim 1, further comprising a pretreatment unit (5), wherein the pretreatment unit (5) is connected with the water distribution component (4),
The water distribution component (4) is arranged in an upper water distribution area (6) of the deep purification unit (7) so as to distribute water on the packing layer (8) in a non-impact mode.
5. The sewage purification system of a highway line facility according to claim 1, wherein the top of the main body reaction unit (22) is provided with an exhaust port (21), and the exhaust port (21) is a unidirectional air port.
6. The highway line facility sewage purification system of claim 1, wherein a packing volume ratio of the sulfur and the calcium carbonate is 1:1.
7. A method of purifying a sewage purification system for a highway line facility according to any one of claims 1 to 6, wherein said method comprises at least:
microorganisms capable of performing sulfur autotrophic denitrification reaction are arranged in at least one filler layer (8) in the deep purification unit (7) so as to decompose pollutants;
the filler layer (8) at least comprises a material mixed by sulfur and calcium carbonate.
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| JP2006255598A (en) * | 2005-03-17 | 2006-09-28 | Nippon Steel Chem Co Ltd | Biological nitrification denitrification treatment system and denitrification treatment method |
| CN114524524A (en) * | 2022-02-18 | 2022-05-24 | 中电环保股份有限公司 | UAD biological filter tower device based on sulfur autotrophy and denitrification method |
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| CN113697945B (en) * | 2020-08-12 | 2022-11-11 | 南京大学 | Biomembrane reactor for deep purification of sewage and operation method thereof |
| CN217535571U (en) * | 2021-12-16 | 2022-10-04 | 中电环保股份有限公司 | UAD biological fluidized bed denitrification device based on sulfur autotrophy |
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| JP2006255598A (en) * | 2005-03-17 | 2006-09-28 | Nippon Steel Chem Co Ltd | Biological nitrification denitrification treatment system and denitrification treatment method |
| CN114524524A (en) * | 2022-02-18 | 2022-05-24 | 中电环保股份有限公司 | UAD biological filter tower device based on sulfur autotrophy and denitrification method |
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